IG-18 and IM-5258

[Greg Boye]

I remember reading an article a year or two ago about someone making some slight changes to an 
IG-18 audio generator to improve its distortion specs.  Does anyone know where I can find this 
article or post on the web?  The reason that I am asking is that I recently purchased an IM-5258 
Harmonic Distortion analyzer and I connected it to my IG-18 audio generator the other night to 
check it out.  It measured my oscillator at 1% THD and I confirmed it with using an older IM-58 
tube analyzer.  Looks like I will tear open the IG-18 tonight to see what I can find.  While I am at it,
I may want to perform the modifications at the same time.

Thanks,
Greg W8NGA 

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